realtime: emit and handle chat_deleted for full chat removals

web/src/hooks/useRealtime.ts

@@ -140,6 +140,13 @@ export function useRealtime() {
             }
           }
         }
+        if (event.event === "chat_deleted") {
+          const chatId = Number(event.payload.chat_id);
+          if (Number.isFinite(chatId)) {
+            chatStore.removeChat(chatId);
+            scheduleReloadChats();
+          }
+        }
         if (event.event === "pong") {
           lastPongAtRef.current = Date.now();
         }